Certification standards for engine emissions

Aircraft engines have to meet mandatory certification requirements established by ICAO’s Committee on Aviation Environmental Protection. ICAO has adopted certification standards for NOx, CO, HC and smoke. A certification requirement for non-volatile particulate matter is under development.

A comprehensive approach

Aircraft are not the only or even the main source of local emissions around airports. Their contribution is relatively small compared to emissions from road traffic and other ground activities. Therefore, all sources must be considered in order to reduce total emissions. Measures should include, for instance, clean and efficient surface access to airports.